Process and system for purifying exhaust gases of an internal-co

Details Process and system for purifying exhaust gases of an internal-co Process and system for purifying exhaust gases of an internal-co

1999-01-25

2000-09-19

Walberg, Teresa

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 300

Patent

active

061194506

ABSTRACT:
An internal-combustion engine includes an engine control system that permits a change-over between a lean operation and a rich operation of the internal-combustion engine, and an exhaust gas purification system. A .lambda.-probe, an SO.sub.x storage catalyst and an NO.sub.x storage catalyst are successively arranged in an exhaust gas line behind the engine. At the start of desulfurization of the SO.sub.x storage catalyst, a change-over takes place from the lean to the rich operation of the engine. Secondary air is fed into the exhaust gas line; a predetermined .lambda. value of the exhaust gases mixed with secondary air and a temperature in the SO.sub.x storage catalyst are measured. At the end of the desulfurization, a change-over takes place from the rich to a lean operation of the engine.

REFERENCES:
patent: 5657625 (1997-08-01), Koga et al.

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